package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    //添加购物车
    public void addShoppingCard(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需要将数量+1
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0); //根据查询条件list中其实只有一条数据,故直接获取第一条即可
            cart.setNumber(cart.getNumber() + 1); //update shopping_cart set number = ? where id = ?
            shoppingCartMapper.updateNumberById(cart);
        }else { //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){//本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

//                shoppingCart.setNumber(1);
//                shoppingCart.setCreateTime(LocalDateTime.now());
            }else {//本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.selectById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

//                shoppingCart.setNumber(1);
//                shoppingCart.setCreateTime(LocalDateTime.now());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    //查看购物车
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    //清空购物车
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    //减少购物车
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //查询一下当前要减少的商品的数量
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);//list中其实也只有一条数据
        ShoppingCart cart = list.get(0);
        Integer number = cart.getNumber();
        if (number > 1){//如果当前商品的数据量>1，则-1
            cart.setNumber(number-1);
            shoppingCartMapper.updateNumberById(cart);
        }else {//如果当前商品的数量为1，则删除该商品
            shoppingCartMapper.deleteById(cart.getId());
        }
    }
}
